Shareholders' Equity And Dividend Restrictions (Change In AOCI Includes Changes In Unrealized Gains And Losses On Investments And Pension Obligations) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Accumulated Other Comprehensive Income, Before Tax
Pension obligations OCI	$ (6)	$ 9	$ 68
Accumulated Other Comprehensive Income, Net of Tax
AOCI, balance at the beginning of the period	(614)
AOCI, balance at the end of the period	(435)	(614)
Accumulated Net Unrealized Investment Gain (Loss)
Accumulated Other Comprehensive Income, Before Tax
AOCI, balance at the beginning of the period	(847)	792	1,026
OCI before investment gains and losses, net, recognized in net income	255	(1,642)	(204)
Investment gains and losses, net, recognized in net income	22	3	(30)
OCI	277	(1,639)	(234)
AOCI, balance at the end of the period	(570)	(847)	792
Accumulated Other Comprehensive Income, Income Tax
AOCI, balance at the beginning of the period	(182)	165	215
OCI before investment gains and losses, net, recognized in net income	55	(347)	(44)
Investment gains and losses, net, recognized in net income	4	0	(6)
OCI	59	(347)	(50)
AOCI, balance at the end of the period	(123)	(182)	165
Accumulated Other Comprehensive Income, Net of Tax
AOCI, balance at the beginning of the period	(665)	627	811
OCI before investment gains and losses, net, recognized in net income	200	(1,295)	(160)
Investment gains and losses, net, recognized in net income	18	3	(24)
OCI	218	(1,292)	(184)
AOCI, balance at the end of the period	(447)	(665)	627
Accumulated Defined Benefit Plans Adjustment
Accumulated Other Comprehensive Income, Before Tax
AOCI, balance at the beginning of the period	36	27	(41)
OCI before investment gains and losses, net, recognized in net income	2	12	62
Investment gains and losses, net, recognized in net income	(8)	(3)	6
OCI	(6)	9	68
AOCI, balance at the end of the period	30	36	27
Accumulated Other Comprehensive Income, Income Tax
AOCI, balance at the beginning of the period	9	7	(7)
OCI before investment gains and losses, net, recognized in net income	1	2	12
Investment gains and losses, net, recognized in net income	(2)	0	2
OCI	(1)	2	14
AOCI, balance at the end of the period	8	9	7
Accumulated Other Comprehensive Income, Net of Tax
AOCI, balance at the beginning of the period	27	20	(34)
OCI before investment gains and losses, net, recognized in net income	1	10	50
Investment gains and losses, net, recognized in net income	(6)	(3)	4
OCI	(5)	7	54
AOCI, balance at the end of the period	22	27	20
Accumulated Net Unrealized Gain (Loss) on Life Policy Reserves, Reinsurance Recoverable And Other
Accumulated Other Comprehensive Income, Before Tax
AOCI, balance at the beginning of the period	29	(444)	(560)
OCI before investment gains and losses, net, recognized in net income	(42)	473	116
Investment gains and losses, net, recognized in net income	0	0	0
OCI	(42)	473	116
AOCI, balance at the end of the period	(13)	29	(444)
Accumulated Other Comprehensive Income, Income Tax
AOCI, balance at the beginning of the period	5	(94)	(118)
OCI before investment gains and losses, net, recognized in net income	(8)	99	24
Investment gains and losses, net, recognized in net income	0	0	0
OCI	(8)	99	24
AOCI, balance at the end of the period	(3)	5	(94)
Accumulated Other Comprehensive Income, Net of Tax
AOCI, balance at the beginning of the period	24	(350)	(442)
OCI before investment gains and losses, net, recognized in net income	(34)	374	92
Investment gains and losses, net, recognized in net income	0	0	0
OCI	(34)	374	92
AOCI, balance at the end of the period	(10)	24	(350)
Accumulated Net Unrealized Gain (Loss) on Life Policy Reserves, Reinsurance Recoverable And Other | Previously Reported
Accumulated Other Comprehensive Income, Before Tax
AOCI, balance at the beginning of the period	29	(444)	(10)
AOCI, balance at the end of the period		29	(444)
Accumulated Other Comprehensive Income, Income Tax
AOCI, balance at the beginning of the period	5	(94)	(2)
AOCI, balance at the end of the period		5	(94)
Accumulated Other Comprehensive Income, Net of Tax
AOCI, balance at the beginning of the period	24	(350)	(8)
AOCI, balance at the end of the period		24	(350)
Accumulated Net Unrealized Gain (Loss) on Life Policy Reserves, Reinsurance Recoverable And Other | Adjustment to purchase price
Accumulated Other Comprehensive Income, Before Tax
AOCI, balance at the beginning of the period	0	0	(550)
AOCI, balance at the end of the period		0	0
Accumulated Other Comprehensive Income, Income Tax
AOCI, balance at the beginning of the period	0	0	(116)
AOCI, balance at the end of the period		0	0
Accumulated Other Comprehensive Income, Net of Tax
AOCI, balance at the beginning of the period	0	0	(434)
AOCI, balance at the end of the period		0	0
Accumulated Other Comprehensive Income (Loss)
Accumulated Other Comprehensive Income, Before Tax
AOCI, balance at the beginning of the period	(782)	375	425
Investments OCI	277	(1,639)	(234)
Pension obligations OCI	(6)	9	68
Life policy reserves, reinsurance recoverable and other OCI	(42)	473	116
Total OCI	229	(1,157)	(50)
AOCI, balance at the end of the period	(553)	(782)	375
Accumulated Other Comprehensive Income, Income Tax
AOCI, balance at the beginning of the period	(168)	78	90
Investments OCI	59	(347)	(50)
Pension obligations OCI	(1)	2	14
Life policy reserves, reinsurance recoverable and other OCI	(8)	99	24
Total OCI	50	(246)	(12)
AOCI, balance at the end of the period	(118)	(168)	78
Accumulated Other Comprehensive Income, Net of Tax
AOCI, balance at the beginning of the period	(614)	297	335
Investments OCI	218	(1,292)	(184)
Pension obligations OCI	(5)	7	54
Life policy reserves, reinsurance recoverable and other OCI	(34)	374	92
Total OCI	179	(911)	(38)
AOCI, balance at the end of the period	(435)	(614)	297
Accumulated Other Comprehensive Income (Loss) | Previously Reported
Accumulated Other Comprehensive Income, Before Tax
AOCI, balance at the beginning of the period	(782)	375	975
AOCI, balance at the end of the period		(782)	375
Accumulated Other Comprehensive Income, Income Tax
AOCI, balance at the beginning of the period	(168)	78	206
AOCI, balance at the end of the period		(168)	78
Accumulated Other Comprehensive Income, Net of Tax
AOCI, balance at the beginning of the period	(614)	297	769
AOCI, balance at the end of the period		(614)	297
Accumulated Other Comprehensive Income (Loss) | Adjustment to purchase price
Accumulated Other Comprehensive Income, Before Tax
AOCI, balance at the beginning of the period	0	0	(550)
AOCI, balance at the end of the period		0	0
Accumulated Other Comprehensive Income, Income Tax
AOCI, balance at the beginning of the period	0	0	(116)
AOCI, balance at the end of the period		0	0
Accumulated Other Comprehensive Income, Net of Tax
AOCI, balance at the beginning of the period	$ 0	0	(434)
AOCI, balance at the end of the period		$ 0	$ 0